dailey



` PATENTED 'PEB.15, 1904. WL M. BAILEY. K METHOD of' CASTING IMPREssIoNs 0F THBTEBTH AND MOUTH.

APPLICATION FILED AUG. B. 1903'.

Z SHEETS-SHEET 1.

No MODEL.

PATBNTED -FEB'. 416, 1904i wfM. DAILY. METHOD 0F CASTING IMPRBSSHIONSVGF THE TBETH VAND MOUTH.

APPLICATION FILED maA s, 190s.

H0 HDEL.

- employed as proof of the original shapeand position of the teeth before treatment, also in 'and placed flat side down with the representa- UNITED STATES Patented February 1e, 1904.

PATENT d OFFICE.

WILBER'M. DAHJEY, :OENEW Youn, N. Y.

METHOD oF cAsTmGiMPsEssloNs oF THE TEETH AND MOUTH.

srncrrrcn'rron forming part of-Lettets Patent No. 752,378, dated February 1e, 1904.

Application filed August l8, 1903.l

To al@ whom, it may concern: l

Be it known that I, VVILBER M. BAILEY, a citizen of the United States, residing inthe borough of Manhattan, city, county, and State of New York, have invented an Improvement in the Methods of Casting Impressions of the Teeth and Mouth, of which the following is a specification. 1

Heretofore in the art of dentistry cast impressions of the teeth and mouth have been order that the teeth may be studied and where teeth are missing to arrange preliminaries for bridgework; but difficulties have been encountered in making these casts of substantial form, in'obtaining an exact reproduction of the teeth and mouth, and also in an eort tov view and consider the cast impressions of the upper and lower jaws in their proper relation to one another, all of which it is the object of my invention to overcome. t

In carrying out my invention the method employed by me comprises making cast impressions of the Whole or parts of the teeth of both jaws rst by taking an impression or matrix in wax or composition of the lower jaw in the usual manner, inverting the same, placing a metal frame about the .impression-tray carrying the wax matrix, illing the space between the frame and the tray and Within the tray with a composition to form a. bed, pouring plaster within the matrix and frame, to fthel top of the frame and allowing the same to set and become level,and at the l'same time casting into the plaster the anchor ends of hooks'. After this casting has become set anddried the frame of metal and the composition forming the bed are removed and there remains a complete cast impression of the teeth of the lower jaw,` the adjacent gums with a projecting edge of plaster outside of the teeth acting as a protection to the representations of teeth. An impression or matrix in Vwax or composition is then made `of ythe teeth of the upper jaw and roof of the mouth and a casting in plaster is made therefrom in the usual manner. The cast of the lower teeth is then taken l tions of teeth uppermost and aframe is placed Serial No. 168,707. (Nomodel.)

l around the periphery or edge and within the back thereof. V The cast impression of the upper teeth is then placed in position over the impression of the lower teeth, the space around between the same and the band ofthe frame and at the back between the impression of the upper teeth and the base and in front of the frame 4is lled with composition. The upper surface of the cast impression of the upper teeth is meanwhile roughened and the anchor ends of hooks engaging the hooks on the lower casting are temporarily held in the back of the frame. Plaster is then filled in above all to' the upper edge ofthe band and the surface leveled; -When the plaster has set and become hard, the frame and band maybe removed andthe composition taken out, leav- -inga complete cast impression of the teeth of thelower and upper jaws and roof of the mouth and a strong body portion all cast with the projecting edge to the impression of the upper jaw the same as tothe impression of the lower jaw for the purpose of preventing injury to the representations of the teeth of the respective jaws, which are connected, so that they occupy the samel position to one another as the natural teeth, Vthe vparts being connected pivotally by the anchor-hooks, so that they swing 'with reference to one another and may be opened as the jaws of a person.

In ,the drawings, Figure l is a plan `representing the tray, the composition filling, and the matrix of the teeth of the lower jaw, with the frame and band surrounding the same preparatory to theparts being filled and the plaster casting made. Fig.- 2 is a vertical section showing the-same parts with the casting of plaster completed and aslab above vthe same to level the surface. Fig. 3 is across-section and elevation of the metai frame employed in connection with the structures shown in Figs. l and 2. Fig. 4 represents a tray-with composition material vhaving a matrix of the teeth of the upper jaw and with the .plaster 'cast of the teeth and the roof of the mouth. Fig. 5 is a vertical cross-section representing the frame employed in the second step of the process. Fig. 6 is a plan of thevframe shown in Fig. 5, the casting ofthe teeth of the lower jaw and the casting of the teeth and roof of IOO the representations of teeth ofthe lower and upper jaws complete and as connected for examination and use.

t represents a tray of metal of usual form,

and a wax or composition material therein,"

and in which wax or composition is formed the matrix. In Fig. l the matrix of the teeth and gums of the lower jaw' is formed as the first step in the process. This of course must be taken with the wax or composition below the tray. After taking this impression this part is inverted and laid upon a suitable support. A similar tray Z2 or cup is employed, receiving Wax or composition material b for taking the impression of the teeth, gums, and

roof of the mouth of the upper jaw, (see Fig. 4,) which view shows the parts in their right position.

A metal frame is employed, which com` prises a box or case c, having base-plates c and band-plates c2. The free ends of the bandplates overlap, and the inner surface of the frame, asvshown in Figs. 1 and 2, is adapted to come against the free end of the tray a and the wax or composition matrix a', the bandplates c2 being appreciably distant from the outer edge of the tray, so that the filling composition material UZ may be placed between the tray and its wax matrix and the inner surface of the band-plates c2 and may also be filled within the said tray a and between it and the surface of the box or case c. The corners of this metal frame are bent, as shown in Figs. 2 and 3, andmortised, as indicated in Figi 3, to receive the anchor hooks 2. These anchor-hooks are substantially screweyes, with cross-bars on their threaded stems.

When the filling composition d is carefully put in position, as shown in Fig. 2, the rubber bands 4 or equivalent devices are employed and extend around the metal frame for holding the same in position and to the impression-tray. Plaster is poured or cast into this metal frame and around said anchor-hooks to hold them securely in place, the position of 'said hooks being shown in full and dotted lines in Figs. 1 and 2. rlhe slab 3, of glass or similar material, after the plastic material is;

plaster allowed to thoroughly dry and harden, after which the rubber bands 4 are removed,

the metal bands c2 are spread apart, the filling composition 0l removed with the tray and the the composition matrix, and there is left a comfor making a matrix of the teeth of the upper jaw and i'oof of the mouth, (see Fig. 4,) and in this is made a plaster cast f of these parts, which is made in the usual manner and is not larger in outline than the tray or the composition matrix held therein. I employ for the next step of thel process a frame which comprises a hollow case g and band-plates g connected thereto against one surface, and which hollow case g fits into the recess of the cast impression of the lower-jaw teeth at the back and which band-plates extend around the vertically-disposed projecting edge e of said cast impression. The plaster cast f of the teeth of the upper jaw and roof of the mouth is now placed in position within said frame and upon and in the proper relation to the teeth of the lower jaw, and the upper surface of this cast impression, where the same and the upper cast impression will `come together, is coated with a material which prevents the adherence of the materials. A filling composition d is now placed within the band-plates g' and between the same and the impressions of the teeth of both the lower and upper jaws, and this filling composition is also employed in front of the hollow `case g upon the base of the plaster cast e, so as to support the rear end of the cast impression of the teeth of the upper jaw and roof of the mouth and close the opening between ythe end thereof and the metal frame. This metal frame is provided with openings 5 for anchor-hooks 6, which engage the anchorhooks 2 in the lowerv casting. Rubber bands 7 or equivalent devices are placed around the latter metal frame. The uppersurface of the plaster cast f of the teeth of the upper jaw and roof of the mouth is kept wet and is preferably roughened or scored, as shown in Fig. 6, soy as to cause the moist plaster poured or packed in above the same to form a union therewith, so that the plaster will be substantially homogeneous and integral. The plaster is then poured into the upper part of the frame above the cast f, lling in the `entire frame to the upper edge, and a slab of glass or similar material 8 is advantageously laid upon the plastic material IOO IIO

and the upper edge of the frame, so as to cause the plastic material to set with a plain i smooth surface,which is parallel to the plain smooth bottom surface of the .cast of the teeth of the lower jaw. When these parts are set, the slab 8 may be removed and the metal frame taken away, together with the lling composition 'when the cast duplicate or impression of the teeth, gums, and roof of the mouth of the upper jaw will be left and will be found to have a vertically-disposed projecting edge la', similar to the projecting edge e of the lower-jaw impression, with the anchor-hooks interlocked, so as to form a hinge-joint between the cast impressions of the lower and upper jaws and embedded in the substantial corners h2'.

The vertically-.disposed projecting edges e and h and the inclined surfaces between the same and the cast impressions of the teeth cause the same to be quite heavy and substantial and serve to keep away from the impressions of the teeth in avertical plane anything which might otherwise cause a breakage in the cast impressions ot the teeth. At the same time it will be apparent that the cast impressions of the teeth are fully visible for the purpose of examination in studying the teeth, noting their peculiarities, and making preparations for other work, and from Fig. 9 it will be noticed that there is between the respective casting an internal aperture or recess which substantially corresponds with the recess within the mouth and that the backs of p the castings have adjacent parts at the outsides which carry the anchor-hooks and are substantially hinged together, so that they,

may be opened by swinging on the -said hooks as a hinged joint, similar to the separation of the teeth. in opening the mouth.

From Fig. 6 it will be noticed that aportion of the anchor-hooks 6 has been cut away, so as to facilitate their disconnection from and their connection with the anchor-hooks of the lower casting for the ready separation and `the second of the lower jaw. Consequently, although the vorder stated is the most natural one to follow, I do not limit myself thereto.

. I claim as my invention- I. The method herein specified of casting impressions of the teeth and mouth, which consists in lirst taking an impression or matrix in suitable material of teeth of the lower jaw, placing the same within a suitable frame or receptacle, filling the space within said receptacle or frame and between the same and the device holding the impression or matrix of the teeth of the lower jaw with a suitable material forming a bed, pouring plaster within the matrix and frame to the top of the frame and allowing the same to set, become level and hard, removing the'frame and the composition lling, taking an impression or matrix in suitable material of teeth of the upper jaw and roof of the mouthk and making a casting therefrom in the usual manner, superimposing this casting upon the casting previously made of teeth of the lowervja'w and placing the same in a suitable frame or receptacle, illing` the space between the said receptacle and the outer sur-face of said castings and also the back of the casting adjacent to said frame with a composition material, and ythen pouring plaster over the same to the top of the frame so as to join with the casting of teeth of the upper jaw and roof of the mouth and form a second cast body, and simultaneously with the making of the said castbodies casting therewith devices forming hinge connections between them.

2. Y As a new article, cast impressions of the teeth and mouth comprising a lower cast body having a flat base, a projecting edge, impres-Y joints, and connecting the respective lower and upper cast bodies.

. Signed by me this 3d day of August, 1903.

. VVILBER M. BAILEY.

Witnesses:

GEO. T. PINCKNEY, S. T. HAVILAND.

IOO 

